Most people glance at the stamp, register that it looks official, and file the document away. Pennsylvania prescribes exactly what that stamp must contain — and knowing the five elements takes about ten seconds to apply.
The five elements
A Pennsylvania notary’s official stamp must be rectangular and show the following, in order:
| # | Element |
|---|---|
| 1 | The words “Commonwealth of Pennsylvania — Notary Seal” |
| 2 | The notary’s name, and the words “Notary Public” |
| 3 | The county in which the notary maintains an office |
| 4 | The date the current commission expires |
| 5 | A seven-digit commission number issued by the Department of State |
Two further rules apply. Words may not be abbreviated, other than name suffixes. And all of the information must be shown clearly — legibility is a requirement rather than an aspiration.
Older stamps are grandfathered. Notaries holding a commission as of 28 March 2026 may continue using their existing stamp until that commission expires. So a stamp in a slightly different format is not automatically a red flag — but the expiry date on it still has to be in the future.
The two elements worth actually checking
Of the five, two carry practical weight for anyone relying on the document.
The expiry date. A notarial act performed after a commission has expired is invalid. That date is printed on the stamp so it can be checked, and checking it is the single most useful thing a recipient can do.
The commission number. Seven digits, issued by the Department of State. It is what ties the stamp to a real, identifiable commission rather than to a plausible-looking rubber stamp.
Why the format is so prescriptive
A notarial act works because a third party — a bank, a county recorder, a court, a foreign government — can rely on it without knowing anyone involved. That reliance rests on the stamp being verifiable.
A standardised format means an examiner in another county, or another country, can look at an impression and know what should be there. It is also what makes an apostille possible, since the Department of State is certifying that the official who signed is genuine — the process described in apostilles and certifications for Pennsylvania documents.
The stamp is only half of it
This is the misunderstanding worth correcting. A stamp on its own does not notarize anything.
Every notarial act requires a certificate — the wording setting out what was performed, before whom, and when. An acknowledgment and a jurat use different wording, because they are different acts with different consequences, as explained in affidavits and sworn statements in Pennsylvania.
The stamp accompanies that certificate. A document carrying an impression but no certificate has been stamped, not notarized — and a careful recipient will spot the difference.
When a stamp causes a rejection
| Problem | Consequence |
|---|---|
| Illegible or smudged impression | May be rejected; re-execution required |
| Commission already expired on the date of the act | The act is invalid |
| Stamp overlapping text so details cannot be read | Frequently rejected on recording |
| Missing certificate wording | Not a notarial act at all |
| Stamped over a correction | Invites questions about the whole document |
| Photocopied stamp on a submitted original | Rejected — originals are required |
County recorders and registries check this properly, because a defective notarization is precisely what their process exists to catch. It is far cheaper to notice a problem at the counter than after a document has travelled.
The stamping device itself
Pennsylvania regulates not just what the stamp says but how it is kept, and the reasoning is worth understanding.
A stamping device is the physical means of producing an official impression. In the wrong hands it can make an unauthorised document look authentic, which is why a notary is expected to keep exclusive control of it rather than leaving it in a shared drawer or lending it to a colleague.
The same principle explains why a notary will not hand you the stamp to apply yourself, and why an impression photocopied onto another page is not a notarization. The act, the certificate and the impression have to happen together, performed by the person whose name is on the device.
If a notary is relaxed about who touches their stamp, that tells you something about how they treat the rest of it.
What it does not tell you
A valid stamp establishes that a commissioned notary performed an act on a date. It says nothing about the document itself.
It does not mean the contents are true, that the document is legally effective, that the terms are fair, or that anyone has reviewed it. Those limits are not incidental — they are the whole design, and they are why a notary may not draft or advise, as set out in notary public versus notario público in Pennsylvania.
A ten-second check
Next time a document comes back notarized, look at the impression and ask:
- Is it rectangular and fully legible?
- Does it name the notary and say Notary Public?
- Does it show a county?
- Is the expiry date after the date of the act?
- Is there a seven-digit commission number?
- Is there certificate wording as well as the stamp?
If any of those is missing, ask about it before the document goes anywhere. Our Bethlehem notary office is happy to be asked — a notary confident in their own commission has no reason to mind. The stamp requirements are set out in 4 Pa. Code § 167.21, Official stamp.
Frequently asked questions
What must a Pennsylvania notary stamp show?
It must be rectangular and display five things in order: the words Commonwealth of Pennsylvania — Notary Seal; the notary’s name and the words Notary Public; the county where they maintain an office; the date the commission expires; and a seven-digit commission number issued by the Department of State.
Can words on the stamp be abbreviated?
No. A word or term on the official stamp may not be abbreviated, with the exception of name suffixes. All the information must also be shown clearly.
What if the stamp is smudged or unreadable?
Legibility is a requirement, not a nicety. An impression that cannot be read may cause the document to be rejected by a recorder, registry or receiving institution — and the fix is re-executing it, not stamping over the top.
Does the commission expiry date matter?
Considerably. A notarial act performed after a commission has expired is invalid. The expiry date is printed on the stamp precisely so that anyone relying on the document can check it.
Are older stamps still valid?
Yes, within limits. Notaries holding commissions as of 28 March 2026 may continue using their existing stamps until that commission expires, despite the current format requirements.
Is the stamp enough on its own?
No. The stamp accompanies a notarial certificate — the wording describing what act was performed. A stamp applied to a document with no certificate does not make it notarized.
Document coming back from somewhere else?
Bring it in if the stamp looks wrong. Ten seconds now beats a rejected filing later. Hablamos Español.